From Fedora Project Wiki

Reporting

Debugging

rdinitdebug
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set -x for the dracut shell
rdbreak=[pre-udev|pre-mount|mount|pre-pivot|]
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drop the shell on defined breakpoint
rdudevinfo
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set udev to loglevel info
dudevdebug
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set udev to loglevel debug
rdnetdebug
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debug network scripts in dracut